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The dielectric and pyroelectric properties of ammonium hydrogen-DL-malate monohydrate NH⊕ ( ⊖ OOCCHOHCH 2 COOH) • H 2 0 were studied as a function of temperature and crystallographic direction. The components of the dielectric tensor at room temperature are within the limits 5.9 ≦ ε≦ 8.6. The pyroelectric coefficient |p| increases from ≈ 18 μC m- 2  K -1  at T= 100 K to 32 μC m -2  K -1  at room temperature. The angular variation of p in the ac-plane of the crystal with symmetry Cc is ≈ 10°.

Dielectric and Pyroelectric Properties of Ammonium Hydrogen-DL-Malate Monohydrate, NH 4 (C 4 H 5 O 5 ) H 2 O